Spring element and construction



July 2, 1946. I KRAKAUER 2,403,379

SPRING ELEMENT AND CONSTRUCTION Filed July 28, 1941 INVENTOR 19222234; fil al {duet BY Patented July 2, 1946 Abraham Krakauer, Brooklyn,

No-"Sag Spring Company, poration of Michigan N. Y., assignor to Detroit, Mich., a cor- Application July 28, 1941, Serial No. 404,301

4 Claims.

My invention relates to springs, and mor particularly to a sinuous type of spring made of convolutions, some of which extend a greater distance from a longitudinal center line than others.

The present invention pertains to a spring strip which may be applied to chairs, davenports, and the like. The spring strip is so made that the convolutions are extended at spaced points which may be abutted and secured together by clips, hog rings and the like, to secure the strips together with portions of the convolutions in spaced relation. The spring strip is coiled on a small diameter, to provide a set against deflection when supported b its ends. When employed on a bed frame, the laterally extending portions are secured together and to the end border wires or to a sinuous spring border strip.

'Accordingly, the main objects of my invention are; to form a sinuous strip from a wire bent in sinuous form, of predetermined length, with the convolutions extended at opposite point at opposite sides of the strip; to form a sprin surface from sinuous spring strips having convolutions of predetermined width with certain of the convolutions at spaced points extended and joined together when aligned with the extended convolution of an adjacent strip; to form a spring surface from a plurality of sinuous strips having convolutions extended at opposit points on opposite sides and aligned with extended portions of adjacent strips and secured together to have the convolutions on either side of the joined convolutions spaced from each other; to connect the projecting convolutions of sinuous spring strips to a border wire of a frame from which the convolutions between the extended convolutions are spaced; to attach a sinuous spring strip having like convolutions to a border wire of a frame and secure to certain convolutions thereof the extending convolutions on an adjacent spring strip; and in general, to form a zig-zag spring strip with sinuous edges which provides spaced connecting points, reduces the number of strips required to form the surface, and provides open areas throughout the surface.

Other objects and features of novelty of my invention will be either specifically pointed out or will become apparent when referring, for a better understanding of my invention, to the following description taken in conjunction with the accompanying drawing, wherein:

Figure 1 is a plan view of a spring strip coiled on a, small diameter which embodies feature of my invention;

Fig. 2 is an enlarged broken view of the sinuous spring strip illustrated in Fig. 1, when secured at its ends;

Fig. 3 is a plan view of a frame having a spring surface formed of the spring strips illustrated in Figs. 1 and 2;

Fig. '4 is an enlarged broken view of a corner of the frame and spring surface illustrated in Fig. 3;

Fig. 5 is, a view of structure, similar to that illustrated in Fig. 4, showing a modified form thereof; and,

Fig. 6 is an enlarged view of the structure illustrated in Fig. 3, taken on the line 6-6 thereof.

The spring strip embodying my invention is sinuously formedfrom wire and alternately ex tended at spaced points on opposite sides to form abutting joinable portions with the portions of the strips therebetween spaced apart to form a spring surface containing a plurality of open areas to reduce the number of strips required to cover the surface. One form of my invention herein illustrated comprises a wire l0 which is bent into sinuous form to provid convolutions ll of predetermined width. At spaced points, extended convolutions I2 are formed which are of greater length than the convolutions H.

It will be noted in Fig. 2, that the convolutions II and I2 are alternately provided and it is to be understood that a greater number of the convolution H and I2 ma be employed. That is to say, a double set of the convolutions II may be provided between each set of convolutions l2, and vice versa. The strip, while being formed in this manner, may be coiled on an arc of small diameter for the purpose of applying a set to the spring which will resist the extension of the strip ends.

The ends of the strip herein illustrated are formed into hooks l3 which project through apertures M in a frame element IS. A tool is employed for stretching the spring to horizontal, or substantially horizontal position as the hook I3 is inserted in the aperture [4 in the frame. After the spring strips are assembled in this manner, or in any other manner to the frame, they are secured in hinged relation to each other at the projecting edges by hog rings, or bands Hi. When the extended convolutions are ab utted and secured together in this manner the intermediate convolutions II are in spaced relation which reduces the number of strips and the amount of wire required to form the surface.

In Fig. 4, I have illustrated the endmost strip I1 as having the extending convolutions l2 attached to a border wire H3. The adjacent convolutions l l are spaced from each other and the border wire so as to reduce the possibility of noise being produced by the adjacent strips when the spring surface is occupied.

In Fig. 5, I have illustrated a sinuous spring strip I9 formed of like convolutions H having all or a portion of the outer convolutions secured to the border wire I8 by a plurality of rings l6. At spaced points the inner convolutions abut the extended convolutions I2 to which they are secured by rings Is. In this arrangement, all or a greater number of the convolutions of the outermost spring strip of the assembly are attached to the border wire it to provide greater support to the outermost convolutions against deflecting below the border wire.

When constructing a spring surface the spring strips must be employed in pairs to have adjacent convolutions extended and abutted. When employing the strips, the amount of wire required for the surface is materially reduced and an increased amount of deflection is provided to the spring surface. The possibility of producing noise by'the rubbing of the ends of the convolution with each other is also materially reduced. .While I have illustrated the spring strips as being bent on the longitudinal axes and formed downwardly into a hook, it is to be understood that the end convolution of the strip may be otherwise formed or extended to be secured by clips, reversely bent tongues, and other known structures.

' What I claim is:

l. A spring construction comprising a plurality of sinuous strips formed of wire bent into S- shaped convolutions of predetermined width and other convolutions of greater width with the convolutions of greater width disposed between a plurality of the convolutions of predetermined width, the adjacent strips being formed with the extended convolutions disposed in the opposite direction to be in aligned abutting relation,

and means for securing the extended convolutions together.

2. A spring construction comprising a plurality of sinuous strips formed of wire bent into S- shaped convolutions of predetermined width and other convolutions of greater width with the convolutions of greater width disposed between a plurality of the convolutions of predetermined width, the adjacent strips being formed with the extended convolutions disposed in the opposite direction to be in aligned abutting relation, means for securing the extended convolutions together, a border wire extending along the longitudinal edge of the strip and abutting the extended convolutions, and means for securing the last-said extended convolutions to the border wire.

3. A spring construction comprising a plurality of sinuous strips formed of wire bent into S- shaped convolutions of predetermined width and other convolutions of greater width with the convoluticns or greater width disposed between a plurality of the convolutions of predetermined Width, the adjacent strips being formed with the extended convolutions disposed in the opposite direction to be in aligned abutting relation; means ior'secu'ring the extended convolutions together,

the endmost strips having like convolutions, a border wire secured tothe edge of the end strips, and means for securing the convolutions of the end stri's to the border wire and to the extended convolutions of the adjacent strip.

4, A, sprin construction [made of adjacent spring strips, each strip being formed of wire bent into zig-zag formation with the side edges of the strip extended at alternate spaced (points throughout thelength oi the strips, means for securing the extended side edges of 7 adjacent strips together with the portions therebetween spaced apart to form open areas in the resulting spring construction.

ABRAHAM KRAKAUER. 

